Green Onyx soothes the heart, bringing a calm emotional state.  It is meant for anyone who wants to speak truth from the heart.  It increases confidence, allowing you to stand up and face any anxiety when confronted with it instead of allowing it to control you.
The Tower is a generator, concentrating its energy in one specific direction, setting and manifesting intentions.  Wherever towers are placed, they emit and focus their energies in intense energy flow.